Thread ring gauge



June 22, 1948; B. FISHMAN 2,443,904

. THREAD RING GAUGE Filed Dec. '7, 1944 Ill .1

INVENTOR.

BERNARD F-ISHNAN Patented June 22, 1948 I manner) RING crane-E. d e nardlish Brbp rn npplication fiecember 7, 1944,- Serial-No;567,1)69

'fI his invention relates rte-mew and useful improvements in a threadMing :gage.

More specifically, it is proposed toprovide a "threadring gageprevided-=with:means increas ing the lif'enf the gage.

Still further, itis proposed to provide a thread ring ---gage--havingmeans for reducing the variation in diametenof ,thethreadalong the widthof the gage aswear takes "place.

Anoth robjectistoepr vid threadrl er a having an unthreaded centenfiStill another objectis.toproyidea ,thread ring gage having a groovedcenter.

Adunther object is togmmz'ide a threadtming rgage itormedof threepantsisecnred togethersthe My .two .outenparts .being .threadedrand the='center part being smoothand havingta larger inside diameter forming,between the threaded parts, a center groove.

Forfurther -eompnehens ombe the invention, :and of the-objectsland.advantages thereofrefer ence will be had to the following descriptionand accompanying drawings, and to the appended claim in which thevarious novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a thread ring gage constructed inaccordance with this invention.

Fig.2 is an enlarged section on the line 2-2 of Fig. 1.

Fig. 3 is a view, similar to Fig. 2, of a thread ring gage constructedin accordance with a modification of this invention.

Fig. 4 is a front view of a thread ring gage constructed in accordancewith a further modification of this invention.

Fig. 5 is an enlarged section on the line 5-5 of Fig. 4.

Thread ring gages of conventional well known types are threaded from oneside of the gage to the other. It has been found that, from continuallythreading a member into the gage from opposite sides thereof that thethreads are subject to wear. This wear in the diameter of the gagingsurface is not uniform, however, throughout the width of the gage. Inthe go gage, the wear will be greater at the sides than at the center.In the not go gage, the wear will be limited to the first two or threethreads in from both sides. The result of this variation in wear is thatthe threads in the center. of the gage will be smaller in diameter thanthe threads at the sides. This type of gage is adjusted tocompenaQlaimwhe -slaw sate for .wvear by "decreasing the diameter of thering, gage, :the ring being: split and provided with suitable.radjustingyandlocking mechanism for this purpose. The present inventionis directed toward sproviding. .a, thread rring :gage ,in which the.center threaded portion .cigreater-,gdiameter cannot rform, thusgreatly plengtheningthe F ifa of therg-age.

A rthread ring gage constructed ;in;accordance with zthiszinventiontisshown inJFigs. :1 andz ,and

indicated. generally by zth reference :numeral, t0

:Thistgage. :m-icomprisesya split rin ody lit split 'or gap I12 ,orawhichis radial. 'I'hegage is adjusted. and set lby-g-means :of..angadl'usting screw sleeve EM, and locking screw 15.

T esa also has one or two adjusting slots 2| and;adjustingrslotiterminalholes 5m. 7 The ring gagedias (EH1:aXia1:1fhOI'eJ'5,TWhlCh contains the, gaging threads. This bore isprovidedwith a oircurn- :af'erential .;or.;annular;center .or :inn I-QQVG' l1. 1' The bDIjfilhESsthG gaging threadscut :in marginal sectionsflanking the undercut channel or groove H, the threads being indicatedon one side by the numeral I8 and on the other by the numeral I9.

The operation of the device is as follows:

When the ring gage is new, the threads I8 and 19 are of the samediameter. In use, the gage may be employed from either side, dependingupon the convenience of the user. After extensive use, however, thethreads l8 and I9 tend to wear and increase in diameter. Such increasemay be compensated for by an adjustment of the adjusting screw l3, thusrestoring the gage to the correct size.

However, as the outer threads of I8 are used more than the innerthreads, and as they are subjected to greater wear, the row of threadsI3 tend to wear conically with the outer threads wearing the most. Thesame is true of the threads [9. However, due to the relatively shortwidth of the threads [8, this conical wearing does not interfere withthe accurate gaging by the ring, and the same is true of the threads l9.This is due to the groove H which, by eliminating center threads in thering, separates the two sets of threads, decreases their width, andprevents any appreciable variation in the diameter of the thread alongthe Width of the gage. This permits the extended use of the gage eventhough the threads 18 and H! are wearing, and permits adjustment by theadjusting device to take up this wear. The importance of the groove I!may bebest understood if it is considered that were no groove I!provided, then the threads l8 and [9 would meet at the center of thering. These center threads would be used least of all the threads on thego gage, and not at all on the not go gage, and would consequentlyreceive little or no wear but would remain their original size while thethreads l8 and I9 increased in diameter.

Eventually the center threads would be of such a different diameter fromthe threads on either side thereof that, in adjusting the ring with amale plug gage, the user would be threading the plug gage into a cone ofconsiderable length and would therefore not be able to get an accuratesetting, the plug gage setting the ring gage ac cording to the centerunworn threads and not according to the threads (18 and 19) to be used.

A thread ring gage H3, constructed in accordance with a modification ofthis invention, is shown in Fig. 3. It distinguishes from the gage H3 inthat, instead of having the groove l1, it

has an unthreaded portion H which acts similarly to the groove 11. Othercorresponding parts are indicated by like references with an accentadded.

A thread ring gage l0" constructed in accordance with a furthermodification of this invention, is shown in Figs. 4 and 5. As a finishedring, it performs similarly to the ring l0. It distinguishes therefromin that the threads l8" are in a ring member [8 the threads [9" are in aring member [9 and the groove I1" is formed by a washer llof largerinside diameter than the members 18 19 The members l8, l9 and washers llare secured together by countersunk screws 22 and dowels or by any othersuitable manner.

It is to be understood that the cross sectional shape and width of theannular groove I! may be varied as desired.

While I have illustrated and described the prefer-red embodiments of myinvention, it is to 4 be understood. that I do not limit myself to theprecise constructions herein disclosed and the right is reserved to allchanges and modifications coming within the scope of the invention asdefined in the appended claim.

Having thus described my invention, what I claim as new, and desire tosecure by United States Letters Patent is:

A thread ring gauge, comprising a pair of identical split rings havingprecision internal screw threads of a constant pitch and continuoushelix, a split ring disposed between the two rings and having aninternal diameter considerably greater than the internal diameter of thetwo rings first named, screws connecting the rings in concentricrelation to each other, the rings having radial slots registering witheach other and located between the screws, and male and female screwsextending through the last-named split ring to constrict or expand thediameter of the first-named split rings, the thickness of the last-namedsplit ring being no greater than the thickness of the first-mentionedsplit rings and its'internal wall surface being concentrically spacedfrom engagement with a screw to be checked by the ring gauge.

BERNARD FISHMAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,433,528 Bryant et al. Oct. 31,1922 1,874,517 Hartness Aug. 30, 1932 FOREIGN PATENTS Number CountryDate 3,461 Great Britain 1913 635,703 Germany 1936

